Hello all,
I ran across your message board while trying to find some info about my bike. I've had my 90 600F since 2000. It was my daily driver for several years, but has since been sitting in my garage. It sat for about 3 years while I gathered a full set of OEM plastic and had it painted. While I was waiting on the plastic to get back from the paint shop, I cleaned the tank and carbs. The issue I'm having now is that it is pretty hard to start. It will only start on full choke, and will only run on a few cylinders for the first 10 minutes or so. The only time I ever had to choke it before was when the temperature was down near freezing. After about 30 minutes of riding, it gets back to running as good as it ever did (idles smooth ect.). It seems that the number 1 cylinder is always the last to kick in. I'm thinking I missed something when cleaning the carbs. All I did to them was clean the needle/seat, main jet, slow jet and set the floats as well as I could. I've got new plugs, K&N filter, battery's charged, and the charging system is working fine. Any ideas?

Thanks,
-Ethan

 

Clean the carbs again, this time don't just clean the jets but use carb cleaner and compressed air to blow out the passageways that run through the carb body including the choke circuits.

The jets are just the beginning of the circuit, the fuel needs to flow past the jets too.

Good luck!

 

make sure your plug leeds are in the right place as i messed it up once and it ran like pooo

 

Are you sure you put all the springs and pieces back correctly? I actually had that problem for a while and it was due to a minor fuel line clog. Hershey has some good info though. I think that would work.

Happy tooling!

 

hopefully you cleaned them properly and left the carb assembly together, otherwise your throttle plates will be way out of wack. Also your float height may be set too high causing the float needle not to open on a few carbs.

also the needle seats have filters in them as well, if you left it sitting for 3 years, odds are they are dirty as well if you didnt clean those.

did you adjust the mixture screws at all? might not be set correctly if you did.

 

I pulled the carbs back off the other day. I'm going to do a better job cleaning this time. I didn't know the seats had a filter under them. I'll pull the seats this time.

The last time I had them off I really didn't change much except for tweaking a few float settings.

 

by tweaking what do you mean? The float height is 8mm, Less if you have a K&N or Airbox Mod.

 

I got my carbs back together. I replaced the needles and seats and cleaned each carb as well as I could without removing it from the plate and soaking it. I put them on yesterday and fired the bike up. It started and ran just like it used to. It started quickly and the throttle response was perfect. Just as I was getting excited about the test drive, I noticed a puddle of gas under the bike. It was leaking from both of the fuel joints. I’ll be ordering the fuel joint sets tonight. I guess I’ll be learning to sync my carbs when I throw it back together.